DHTML Utopia: Modern Web Design Using JavaScript & DOM by Stuart contributes to Stylish Scripting: SitePoint’s DHTML and CSS Blog. About The. Modern Web Design Using JavaScript & DOM. HTML Source Review. Now that using nice, valid HTML and CSS for layout have been well and truly cracked. I remember the first time I saw an image rollover on a web site, and being blown away by the sheer coolness of such a thing. Of course I.

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They may also require a different approach than having your preferred tools write HTML for you. They return information on the size and position of an element in pixels.

DHTML Utopia: Modern Web Design Using JavaScript & DOM — SitePoint

Lots of Websites contain photo galleries: JavaScript allows you to collapse expressions together like this. Every page element fires a given selection weeb events.

A huge variety of these CSS hacks is documented dhmtl each browser in various places around the Web; usjng the section called “Further Reading” for more. Alternately, imagine yourself looking out of the window of a moving train without turning your head.

A lot of tutorials on the Web cover JavaScript. This allows users to add to the form as many entries as they like. Conceptually, the code works as follows: The second line applies the class to a given cell, but our script needs to find the appropriate cells first. This technique can also be useful, as mentioned, in photo galleries containing images dhtm, look similar when displayed at thumbnail size. The mouseout function does the exact opposite: Why am I so unenthusiastic about browser sniffing?


I visit that article all the time to cut and paste the one I need! Listeners get to share events, and events get to share listeners. This is a slightly suspect technique: A Web page is a document. We use browser detection. Any hope of your being able to control the appearance and functionality of your pages across browsers goes right out the window unless you do this right. Usng can apply this effect to tables in an HTML document using event listeners. And now, to Chapter 1. In essence, it allows you to state how you want each element on your page to look.

Some events have a default action.

DHTML Utopia; modern web design using JavaScript & DOM.

As a result, event listeners will only be assigned once the document has finished loading, and all elements are available. An added bonus of using CSS to provide the style information is that we can apply different highlighting to different tables on the page without changing the script. If the cursor moves 50 pixels left, the big image will move pixels left: Here are the six items in all their detail. The textarea must exist before the JavaScript code can assign an event listener to it.

We might use the following code:. The function is specified using only the name of the function; do not place brackets after it, as in aKeyWasPressedas this would call the function.

You can see that some of this code is likely to appear in every project we attempt, particularly those parts that have to do with listener installation. Not all events bubble; for example, focus and blur events do not. The mouseover and mouseout functions wrb little other than the actual image swapping work. From this last example, we can see more clearly why valid HTML, including properly nested elements, is important. A good JavaScript development environment makes working with JavaScript far easier than it would otherwise be.


We then manipulate the position of that background image so that it moves in accordance with the cursor. Halting bubbling can be done in two ways, as is the case with much event handling: Understanding the processes by which events are fired, and by which code is hooked to those events, is vital to DHTML programming.

Failing that, we look for Internet Explorer’s proprietary attachEvent method on the object. If we move the cursor to the extreme bottom-right of the viewing area, we want deslgn big image to move by almost its entire size — but not quite!

Should the bottom-right corner of the full-sized image be in the top-left corner of the viewing area? If not, the event object passed to the function as ewhich also has a keyCode property, is used. Similarly, the last child in this case, the second li has its own special property:. This title contains over pages of DHTML techniques that enrich the user experience without sacrificing usability or standards-compliance.

These first four chapters should give you a taste of the action. When we test the Function object instead, we’re assessing it for existence. Removing an element is very similar to the process of adding one: When we desivn a link, that link fires a click event, and handleLink is run.

To move the Yahoo! The tasks are neatly divided.